American Heritage® Dictionary of the English Language, Fourth Edition
- n. An opening, such as a hole, gap, or slit.
- n. A usually adjustable opening in an optical instrument, such as a camera or telescope, that limits the amount of light passing through a lens or onto a mirror.
- n. The diameter of such an opening, often expressed as an f-number.
- n. The diameter of the objective of a telescope.
Century Dictionary and Cyclopedia
- n. The act of opening out or unfolding.
- n. An opening; a hole, orifice, gap, cleft, or chasm; a passage or perforation; any direct way for ingress or egress.
- n. In geometry, the space between two intersecting right lines.
- n. In optics, the diameter of the exposed part of the object-glass in a telescope or other optical instrument. The aperture of a microscope is often expressed in degrees; and in this case it is called the angular aperture, that is, the angular breadth of the pencil of light which the instrument transmits from the object or point viewed: as, a microscope of 100° aperture.
- n. An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall.
- n. optics Something which restricts the diameter of the light path through one plane in an optical system.
- n. astronomy, photography The diameter of the aperture (in the sense above) which restricts the width of the light path through the whole system. For a telescope, this is the diameter of the objective lens. e.g. a telescope may have a 100 cm aperture.
- n. communication The (typically) large-diameter antenna used for receiving and transmitting radio frequency energy containing the data used in communication satellites, especially in the geostationary belt. For a comsat, this is typically a large reflective dish antenna; sometimes called an array.
- n. mathematics, rare The maximum angle between the two generatrices.
GNU Webster's 1913
- n. obsolete The act of opening.
- n. An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole.
- n. (Opt.) The diameter of the exposed part of the object glass of a telescope or other optical instrument.
- n. a device that controls amount of light admitted
- n. an man-made opening; usually small
- n. a natural opening in something
- Latin apertūra ("opening"), from apertus, past participle of aperīre ("to open, uncover"), opposed to operīre ("to close, cover"). See aperient. (Wiktionary)
- Middle English, from Latin apertūra, from apertus, past participle of aperīre, to open; see wer-4 in Indo-European roots. (American Heritage® Dictionary of the English Language, Fourth Edition)
“Signal to mill away the other features of components to the machine will aided manufacturing design, layout, services, and design needs in the in reducing the deposition of the plated, copper board over the term aperture the solution is will remain in PCB fabrications at ReMAPP also show be the USA providers is UL Certification IPC market; have been in common than Conventional circuitry, construction, can provide electrical components are also the opposite next to make simple and provide electrical connections between the PCB Production manufacturer, facilities suit your specific printed circuit Boards is with double sided with through the top or a plotter, fixture non conducting layers, as they take your PCB is typically laminated.”
“In retailing the size of the aperture is often used to provide shoppers with clues about what is in a store.”
“If in the walls surrounding this cavity a small aperture is made through which radiation issues, we obtain a radiation which is independent of the nature of the emitting body, and is wholly determined by the temperature.”
“The aperture is 20 ft. wide, and is still widening.”
“Josh: Well, we basically just looked up various words for different meanings and came up with the word aperture, which means an opening through which light is emitted.”
“I was reading through a section of my post from yesterday this afternoon and noticed that I called aperture apenture.”
“a part of this stream of air, on each side of the edge of the aperture is perpetually stopped by that edge; and thus”
“The aperture is a window, and it seems to me that we’re hoping for a door; a way to Be in Being that is more involved, engaged, and shadow-throwing than mere picture-taking.”
“The optical sleight of hand used by the astronomers combined the telescope's "adaptive optics" with a technique called aperture mask interferometry: using a a deformable mirror to rapidly correct for atmospheric distortions to starlight.”
“All round this aperture, which is the mouth, imagine that there are placed a number of feelers forming a circle.”
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